/**
  ******************************************************************************
  * @file    stm8_eval_spi_sd.c
  * @author  MCD Application Team
  * @version V2.1.3
  * @date    28-June-2013
  * @brief   This file provides a set of functions needed to manage the SPI SD
  *          Card memory mounted on STM8xx-EVAL board (refer to stm8_eval.h
  *          to know about the boards supporting this memory).
  *          It implements a high level communication layer for read and write
  *          from/to this memory. The needed STM8 hardware resources (SPI and
  *          GPIO) are defined in stm8xx_eval.h file, and the initialization is
  *          performed in SD_LowLevel_Init() function declared in stm8xx_eval.c
  *          file.
  *          You can easily tailor this driver to any other development board,
  *          by just adapting the defines for hardware resources and
  *          SD_LowLevel_Init() function.
  *
  *          +-------------------------------------------------------+
  *          |                     Pin assignment                    |
  *          +-------------------------+---------------+-------------+
  *          |  STM8 SPI Pins         |     SD        |    Pin      |
  *          +-------------------------+---------------+-------------+
  *          | SD_SPI_CS_PIN           |   ChipSelect  |    1        |
  *          | SD_SPI_MOSI_PIN / MOSI  |   DataIn      |    2        |
  *          |                         |   GND         |    3 (0 V)  |
  *          |                         |   VDD         |    4 (3.3 V)|
  *          | SD_SPI_SCK_PIN / SCLK   |   Clock       |    5        |
  *          |                         |   GND         |    6 (0 V)  |
  *          | SD_SPI_MISO_PIN / MISO  |   DataOut     |    7        |
  *          +-------------------------+---------------+-------------+
  ******************************************************************************
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm8_eval_spi_sd.h"

/** @addtogroup Utilities
  * @{
  */

/** @addtogroup STM8_EVAL
  * @{
  */

/** @addtogroup Common
  * @{
  */

/** @addtogroup STM8_EVAL_SPI_SD
  * @brief      This file includes the SD card driver of STM8-EVAL boards.
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/** @defgroup STM8_EVAL_SPI_SD_Private_Functions
  * @{
  */

/**
  * @brief  DeInitializes the SD/SD communication.
  * @param  None
  * @retval None
  */
void SD_DeInit(void)
{
    SD_LowLevel_DeInit();
}

/**
  * @brief  Initializes the SD/SD communication.
  * @param  None
  * @retval The SD Response:
  *         - SD_RESPONSE_FAILURE: Sequence failed
  *         - SD_RESPONSE_NO_ERROR: Sequence succeed
  */
uint8_t SD_Init(void)
{
    uint32_t i = 0;

    /*!< Initialize SD_SPI */
    SD_LowLevel_Init();

    /*!< SD chip select high */
    SD_CS_LOW();

    /*!< Send dummy byte 0xFF, 10 times with CS high */
    /*!< Rise CS and MOSI for 80 clocks cycles */
    for (i = 0; i <= 9; i++)
    {
        /*!< Send dummy byte 0xFF */
        SD_WriteByte(SD_DUMMY_BYTE);
    }
    /*------------Put SD in SPI mode--------------*/
    /*!< SD initialized and set to SPI mode properly */
    return (SD_GoIdleState());
}

/**
 * @brief  Detect if SD card is correctly plugged in the memory slot.
 * @param  None
 * @retval Return if SD is detected or not
 */
uint8_t SD_Detect(void)
{
    __IO uint8_t status = SD_PRESENT;

    /*!< Check GPIO to detect SD */
    if (GPIO_ReadInputData(SD_DETECT_GPIO_PORT) & SD_DETECT_PIN)
    {
        status = SD_NOT_PRESENT;
    }
    return status;
}

/**
  * @brief  Returns information about specific card.
  * @param  cardinfo: pointer to a SD_CardInfo structure that contains all SD
  *         card information.
  * @retval The SD Response:
  *         - SD_RESPONSE_FAILURE: Sequence failed
  *         - SD_RESPONSE_NO_ERROR: Sequence succeed
  */
uint8_t SD_GetCardInfo(SD_CardInfo *cardinfo)
{
    uint8_t status = SD_RESPONSE_FAILURE;

    status = SD_GetCSDRegister(&(cardinfo->SD_csd));
    status = SD_GetCIDRegister(&(cardinfo->SD_cid));
    cardinfo->CardCapacity = (cardinfo->SD_csd.DeviceSize + 1) ;
    cardinfo->CardCapacity *= (1 << (cardinfo->SD_csd.DeviceSizeMul + 2));
    cardinfo->CardBlockSize = 1 << (cardinfo->SD_csd.RdBlockLen);
    cardinfo->CardCapacity *= cardinfo->CardBlockSize;

    /*!< Returns the reponse */
    return status;
}

/**
  * @brief  Reads a block of data from the SD.
  * @param  pBuffer: pointer to the buffer that receives the data read from the
  *                  SD.
  * @param  ReadAddr: SD's internal address to read from.
  * @param  BlockSize: the SD card Data block size.
  * @retval The SD Response:
  *         - SD_RESPONSE_FAILURE: Sequence failed
  *         - SD_RESPONSE_NO_ERROR: Sequence succeed
  */
uint8_t SD_ReadBlock(uint8_t *pBuffer, uint32_t ReadAddr, uint16_t BlockSize)
{
    uint32_t i = 0;
    uint8_t rvalue = SD_RESPONSE_FAILURE;

    /*!< SD chip select low */
    SD_CS_LOW();

    /*!< Send CMD17 (SD_CMD_READ_SINGLE_BLOCK) to read one block */
    SD_SendCmd(SD_CMD_READ_SINGLE_BLOCK, ReadAddr, 0xFF);

    /*!< Check if the SD acknowledged the read block command: R1 response (0x00: no errors) */
    if (!SD_GetResponse(SD_RESPONSE_NO_ERROR))
    {
        /*!< Now look for the data token to signify the start of the data */
        if (!SD_GetResponse(SD_START_DATA_SINGLE_BLOCK_READ))
        {
            /*!< Read the SD block data : read NumByteToRead data */
            for (i = 0; i < BlockSize; i++)
            {
                /*!< Save the received data */
                *pBuffer = SD_ReadByte();

                /*!< Point to the next location where the byte read will be saved */
                pBuffer++;
            }
            /*!< Get CRC bytes (not really needed by us, but required by SD) */
            SD_ReadByte();
            SD_ReadByte();
            /*!< Set response value to success */
            rvalue = SD_RESPONSE_NO_ERROR;
        }
    }
    /*!< SD chip select high */
    SD_CS_HIGH();

    /*!< Send dummy byte: 8 Clock pulses of delay */
    SD_WriteByte(SD_DUMMY_BYTE);

    /*!< Returns the reponse */
    return rvalue;

}

/**
  * @brief  Read a buffer (many blocks) from the SD card.
  * @param  pBuffer : pointer to the buffer that receives the data read from the SD.
  * @param  ReadAddr : SD's internal address to read from.
  * @param  NumByteToRead : number of bytes to read from the SD.
  * @retval SD Response:
  *   - SD_RESPONSE_FAILURE: Sequence failed.
  *   - SD_RESPONSE_NO_ERROR: Sequence succeed.
  */
uint8_t SD_ReadBuffer(uint8_t *pBuffer, uint32_t ReadAddr, uint32_t NumByteToRead)
{
    uint32_t i = 0, NbrOfBlock = 0, Offset = 0;
    uint8_t rvalue = SD_RESPONSE_FAILURE;

    /* Calculate number of blocks to read */
    NbrOfBlock = NumByteToRead / SD_BLOCK_SIZE;
    /* SD chip select low */
    SD_CS_LOW();

    /* Data transfer */
    while (NbrOfBlock --)
    {
        /* Send CMD17 (SD_READ_SINGLE_BLOCK) to read one block */
        SD_SendCmd (SD_CMD_READ_SINGLE_BLOCK, ReadAddr + Offset, 0xFF);
        /* Check if the SD acknowledged the read block command: R1 response (0x00: no errors) */
        if (SD_GetResponse(SD_RESPONSE_NO_ERROR))
        {
            return  SD_RESPONSE_FAILURE;
        }
        /* Now look for the data token to signify the start of the data */
        if (!SD_GetResponse(SD_START_DATA_SINGLE_BLOCK_READ))
        {
            /* Read the SD block data : read NumByteToRead data */
            for (i = 0; i < SD_BLOCK_SIZE; i++)
            {
                /* Read the pointed data */
                *pBuffer = SD_ReadByte();
                /* Point to the next location where the byte read will be saved */
                pBuffer++;
            }
            /* Set next read address*/
            Offset += 512;
            /* get CRC bytes (not really needed by us, but required by SD) */
            SD_ReadByte();
            SD_ReadByte();
            /* Set response value to success */
            rvalue = SD_RESPONSE_NO_ERROR;
        }
        else
        {
            /* Set response value to failure */
            rvalue = SD_RESPONSE_FAILURE;
        }
    }

    /* SD chip select high */
    SD_CS_HIGH();
    /* Send dummy byte: 8 Clock pulses of delay */
    SD_WriteByte(SD_DUMMY_BYTE);
    /* Returns the reponse */
    return rvalue;
}

/**
  * @brief  Writes a block on the SD
  * @param  pBuffer: pointer to the buffer containing the data to be written on
  *                  the SD.
  * @param  WriteAddr: address to write on.
  * @param  BlockSize: the SD card Data block size.
  * @retval The SD Response:
  *         - SD_RESPONSE_FAILURE: Sequence failed
  *         - SD_RESPONSE_NO_ERROR: Sequence succeed
  */
uint8_t SD_WriteBlock(uint8_t *pBuffer, uint32_t WriteAddr, uint16_t BlockSize)
{
    uint32_t i = 0;
    uint8_t rvalue = SD_RESPONSE_FAILURE;

    /*!< SD chip select low */
    SD_CS_LOW();

    /*!< Send CMD24 (SD_CMD_WRITE_SINGLE_BLOCK) to write multiple block */
    SD_SendCmd(SD_CMD_WRITE_SINGLE_BLOCK, WriteAddr, 0xFF);

    /*!< Check if the SD acknowledged the write block command: R1 response (0x00: no errors) */
    if (!SD_GetResponse(SD_RESPONSE_NO_ERROR))
    {
        /*!< Send a dummy byte */
        SD_WriteByte(SD_DUMMY_BYTE);

        /*!< Send the data token to signify the start of the data */
        SD_WriteByte(0xFE);

        /*!< Write the block data to SD : write count data by block */
        for (i = 0; i < BlockSize; i++)
        {
            /*!< Send the pointed byte */
            SD_WriteByte(*pBuffer);
            /*!< Point to the next location where the byte read will be saved */
            pBuffer++;
        }

        /* Send DUMMY bytes when the number of data to be written are lower
           than the SD card BLOCK size (512 Byte) */
        for (; i != SD_BLOCK_SIZE; i++)
        {
            /* Send the pointed byte */
            SD_WriteByte(SD_DUMMY_BYTE);
        }

        /*!< Put CRC bytes (not really needed by us, but required by SD) */
        SD_ReadByte();
        SD_ReadByte();

        /*!< Read data response */
        if (SD_GetDataResponse() == SD_DATA_OK)
        {
            rvalue = SD_RESPONSE_NO_ERROR;
        }
    }
    /*!< SD chip select high */
    SD_CS_HIGH();
    /*!< Send dummy byte: 8 Clock pulses of delay */
    SD_WriteByte(SD_DUMMY_BYTE);

    /*!< Returns the reponse */
    return rvalue;

}


/**
  * @brief  Write a buffer (many blocks) in the SD card.
  * @note   The amount of data to write should be a multiple of SD card BLOCK
  *         size (512 Byte).
  * @param  pBuffer : pointer to the buffer containing the data to be written on the SD.
  * @param  WriteAddr : address to write on.
  * @param  NumByteToWrite : number of data to write.
  * @retval SD Response:
  *   - SD_RESPONSE_FAILURE: Sequence failed.
  *   - SD_RESPONSE_NO_ERROR: Sequence succeed.
  */
uint8_t SD_WriteBuffer(uint8_t *pBuffer, uint32_t WriteAddr, uint32_t NumByteToWrite)
{
    uint32_t i = 0, NbrOfBlock = 0, Offset = 0;
    uint8_t rvalue = SD_RESPONSE_FAILURE;

    /* Calculate number of blocks to write */
    NbrOfBlock = NumByteToWrite / SD_BLOCK_SIZE;
    /* SD chip select low */
    SD_CS_LOW();

    /* Data transfer */
    while (NbrOfBlock--)
    {
        /* Send CMD24 (SD_WRITE_BLOCK) to write blocks */
        SD_SendCmd(SD_CMD_WRITE_SINGLE_BLOCK, WriteAddr + Offset, 0xFF);

        /* Check if the SD acknowledged the write block command: R1 response (0x00: no errors) */
        if (SD_GetResponse(SD_RESPONSE_NO_ERROR))
        {
            return SD_RESPONSE_FAILURE;
        }
        /* Send dummy byte */
        SD_WriteByte(SD_DUMMY_BYTE);
        /* Send the data token to signify the start of the data */
        SD_WriteByte(SD_START_DATA_SINGLE_BLOCK_WRITE);
        /* Write the block data to SD : write count data by block */
        for (i = 0; i < SD_BLOCK_SIZE; i++)
        {
            /* Send the pointed byte */
            SD_WriteByte(*pBuffer);
            /* Point to the next location where the byte read will be saved */
            pBuffer++;
        }
        /* Set next write address */
        Offset += 512;
        /* Put CRC bytes (not really needed by us, but required by SD) */
        SD_ReadByte();
        SD_ReadByte();
        /* Read data response */
        if (SD_GetDataResponse() == SD_DATA_OK)
        {
            /* Set response value to success */
            rvalue = SD_RESPONSE_NO_ERROR;
        }
        else
        {
            /* Set response value to failure */
            rvalue = SD_RESPONSE_FAILURE;
        }
    }

    /* SD chip select high */
    SD_CS_HIGH();
    /* Send dummy byte: 8 Clock pulses of delay */
    SD_WriteByte(SD_DUMMY_BYTE);
    /* Returns the reponse */
    return rvalue;
}

/**
  * @brief  Read the CSD card register.
  *         Reading the contents of the CSD register in SPI mode is a simple
  *         read-block transaction.
  * @param  SD_csd: pointer on an SCD register structure
  * @retval The SD Response:
  *         - SD_RESPONSE_FAILURE: Sequence failed
  *         - SD_RESPONSE_NO_ERROR: Sequence succeed
  */
uint8_t SD_GetCSDRegister(SD_CSD *SD_csd)
{
    uint32_t i = 0;
    uint8_t rvalue = SD_RESPONSE_FAILURE;
    uint8_t CSD_Tab[16];

    /*!< SD chip select low */
    SD_CS_LOW();
    /*!< Send CMD9 (CSD register) or CMD10(CSD register) */
    SD_SendCmd(SD_CMD_SEND_CSD, 0, 0xFF);
    /*!< Wait for response in the R1 format (0x00 is no errors) */
    if (!SD_GetResponse(SD_RESPONSE_NO_ERROR))
    {
        if (!SD_GetResponse(SD_START_DATA_SINGLE_BLOCK_READ))
        {
            for (i = 0; i < 16; i++)
            {
                /*!< Store CSD register value on CSD_Tab */
                CSD_Tab[i] = SD_ReadByte();
            }
        }
        /*!< Get CRC bytes (not really needed by us, but required by SD) */
        SD_WriteByte(SD_DUMMY_BYTE);
        SD_WriteByte(SD_DUMMY_BYTE);
        /*!< Set response value to success */
        rvalue = SD_RESPONSE_NO_ERROR;
    }
    /*!< SD chip select high */
    SD_CS_HIGH();
    /*!< Send dummy byte: 8 Clock pulses of delay */
    SD_WriteByte(SD_DUMMY_BYTE);

    /*!< Byte 0 */
    SD_csd->CSDStruct = (uint8_t)((CSD_Tab[0] & 0xC0) >> 6);
    SD_csd->SysSpecVersion = (uint8_t)((CSD_Tab[0] & 0x3C) >> 2);
    SD_csd->Reserved1 = (uint8_t)(CSD_Tab[0] & 0x03);

    /*!< Byte 1 */
    SD_csd->TAAC = CSD_Tab[1];

    /*!< Byte 2 */
    SD_csd->NSAC = CSD_Tab[2];

    /*!< Byte 3 */
    SD_csd->MaxBusClkFrec = CSD_Tab[3];

    /*!< Byte 4 */
    SD_csd->CardComdClasses = CSD_Tab[4] << 4;

    /*!< Byte 5 */
    SD_csd->CardComdClasses |= (CSD_Tab[5] & 0xF0) >> 4;
    SD_csd->RdBlockLen = (uint8_t)(CSD_Tab[5] & 0x0F);

    /*!< Byte 6 */
    SD_csd->PartBlockRead = (uint8_t)((CSD_Tab[6] & 0x80) >> 7);
    SD_csd->WrBlockMisalign = (uint8_t)((CSD_Tab[6] & 0x40) >> 6);
    SD_csd->RdBlockMisalign = (uint8_t)((CSD_Tab[6] & 0x20) >> 5);
    SD_csd->DSRImpl = (uint8_t)((CSD_Tab[6] & 0x10) >> 4);
    SD_csd->Reserved2 = 0; /*!< Reserved */

    SD_csd->DeviceSize = (CSD_Tab[6] & 0x03) << 10;

    /*!< Byte 7 */
    SD_csd->DeviceSize |= (CSD_Tab[7]) << 2;

    /*!< Byte 8 */
    SD_csd->DeviceSize |= (CSD_Tab[8] & 0xC0) >> 6;

    SD_csd->MaxRdCurrentVDDMin = (uint8_t)((CSD_Tab[8] & 0x38) >> 3);
    SD_csd->MaxRdCurrentVDDMax = (uint8_t)((CSD_Tab[8] & 0x07));

    /*!< Byte 9 */
    SD_csd->MaxWrCurrentVDDMin = (uint8_t)((CSD_Tab[9] & 0xE0) >> 5);
    SD_csd->MaxWrCurrentVDDMax = (uint8_t)((CSD_Tab[9] & 0x1C) >> 2);
    SD_csd->DeviceSizeMul = (uint8_t)((CSD_Tab[9] & 0x03) << 1);
    /*!< Byte 10 */
    SD_csd->DeviceSizeMul |= (uint8_t)((CSD_Tab[10] & 0x80) >> 7);

    SD_csd->EraseGrSize = (uint8_t)((CSD_Tab[10] & 0x40) >> 6);
    SD_csd->EraseGrMul = (uint8_t)((CSD_Tab[10] & 0x3F) << 1);

    /*!< Byte 11 */
    SD_csd->EraseGrMul |= (uint8_t)((CSD_Tab[11] & 0x80) >> 7);
    SD_csd->WrProtectGrSize = (uint8_t)((CSD_Tab[11] & 0x7F));

    /*!< Byte 12 */
    SD_csd->WrProtectGrEnable = (uint8_t)((CSD_Tab[12] & 0x80) >> 7);
    SD_csd->ManDeflECC = (uint8_t)((CSD_Tab[12] & 0x60) >> 5);
    SD_csd->WrSpeedFact = (uint8_t)((CSD_Tab[12] & 0x1C) >> 2);
    SD_csd->MaxWrBlockLen = (uint8_t)((CSD_Tab[12] & 0x03) << 2);

    /*!< Byte 13 */
    SD_csd->MaxWrBlockLen |= (uint8_t)((CSD_Tab[13] & 0xC0) >> 6);
    SD_csd->WriteBlockPaPartial = (uint8_t)((CSD_Tab[13] & 0x20) >> 5);
    SD_csd->Reserved3 = 0;
    SD_csd->ContentProtectAppli = (uint8_t)(CSD_Tab[13] & 0x01);

    /*!< Byte 14 */
    SD_csd->FileFormatGrouop = (uint8_t)((CSD_Tab[14] & 0x80) >> 7);
    SD_csd->CopyFlag = (uint8_t)((CSD_Tab[14] & 0x40) >> 6);
    SD_csd->PermWrProtect = (uint8_t)((CSD_Tab[14] & 0x20) >> 5);
    SD_csd->TempWrProtect = (uint8_t)((CSD_Tab[14] & 0x10) >> 4);
    SD_csd->FileFormat = (uint8_t)((CSD_Tab[14] & 0x0C) >> 2);
    SD_csd->ECC = (uint8_t)(CSD_Tab[14] & 0x03);

    /*!< Byte 15 */
    SD_csd->CSD_CRC = (uint8_t)((CSD_Tab[15] & 0xFE) >> 1);
    SD_csd->Reserved4 = 1;

    /*!< Return the reponse */
    return rvalue;
}

/**
  * @brief  Read the CID card register.
  *         Reading the contents of the CID register in SPI mode is a simple
  *         read-block transaction.
  * @param  SD_cid: pointer on an CID register structure
  * @retval The SD Response:
  *         - SD_RESPONSE_FAILURE: Sequence failed
  *         - SD_RESPONSE_NO_ERROR: Sequence succeed
  */
uint8_t SD_GetCIDRegister(SD_CID *SD_cid)
{
    uint32_t i = 0;
    uint8_t rvalue = SD_RESPONSE_FAILURE;
    uint8_t CID_Tab[16];

    /*!< SD chip select low */
    SD_CS_LOW();

    /*!< Send CMD10 (CID register) */
    SD_SendCmd(SD_CMD_SEND_CID, 0, 0xFF);

    /*!< Wait for response in the R1 format (0x00 is no errors) */
    if (!SD_GetResponse(SD_RESPONSE_NO_ERROR))
    {
        if (!SD_GetResponse(SD_START_DATA_SINGLE_BLOCK_READ))
        {
            /*!< Store CID register value on CID_Tab */
            for (i = 0; i < 16; i++)
            {
                CID_Tab[i] = SD_ReadByte();
            }
        }
        /*!< Get CRC bytes (not really needed by us, but required by SD) */
        SD_WriteByte(SD_DUMMY_BYTE);
        SD_WriteByte(SD_DUMMY_BYTE);
        /*!< Set response value to success */
        rvalue = SD_RESPONSE_NO_ERROR;
    }
    /*!< SD chip select high */
    SD_CS_HIGH();
    /*!< Send dummy byte: 8 Clock pulses of delay */
    SD_WriteByte(SD_DUMMY_BYTE);

    /*!< Byte 0 */
    SD_cid->ManufacturerID = CID_Tab[0];

    /*!< Byte 1 */
    SD_cid->OEM_AppliID = CID_Tab[1] << 8;

    /*!< Byte 2 */
    SD_cid->OEM_AppliID |= CID_Tab[2];

    /*!< Byte 3 */
    SD_cid->ProdName1 = ((uint32_t)CID_Tab[3] << 24);

    /*!< Byte 4 */
    SD_cid->ProdName1 |= ((uint32_t)CID_Tab[4] << 16);

    /*!< Byte 5 */
    SD_cid->ProdName1 |= CID_Tab[5] << 8;

    /*!< Byte 6 */
    SD_cid->ProdName1 |= CID_Tab[6];

    /*!< Byte 7 */
    SD_cid->ProdName2 = CID_Tab[7];

    /*!< Byte 8 */
    SD_cid->ProdRev = CID_Tab[8];

    /*!< Byte 9 */
    SD_cid->ProdSN = ((uint32_t)CID_Tab[9] << 24);

    /*!< Byte 10 */
    SD_cid->ProdSN |= ((uint32_t)CID_Tab[10] << 16);

    /*!< Byte 11 */
    SD_cid->ProdSN |= CID_Tab[11] << 8;

    /*!< Byte 12 */
    SD_cid->ProdSN |= CID_Tab[12];

    /*!< Byte 13 */
    SD_cid->Reserved1 |= (uint8_t)((CID_Tab[13] & 0xF0) >> 4);
    SD_cid->ManufactDate = (CID_Tab[13] & 0x0F) << 8;

    /*!< Byte 14 */
    SD_cid->ManufactDate |= CID_Tab[14];

    /*!< Byte 15 */
    SD_cid->CID_CRC = (uint8_t)((CID_Tab[15] & 0xFE) >> 1);
    SD_cid->Reserved2 = 1;

    /*!< Return the reponse */
    return rvalue;
}

/**
  * @brief  Send 5 bytes command to the SD card.
  * @param  Cmd: The user expected command to send to SD card.
  * @param  Arg: The command argument.
  * @param  Crc: The CRC.
  * @retval None
  */
void SD_SendCmd(uint8_t Cmd, uint32_t Arg, uint8_t Crc)
{
    uint32_t i = 0x00;

    uint8_t Frame[6];

    Frame[0] = (uint8_t)(Cmd | 0x40); /*!< Construct byte 1 */

    Frame[1] = (uint8_t)(Arg >> 24); /*!< Construct byte 2 */

    Frame[2] = (uint8_t)(Arg >> 16); /*!< Construct byte 3 */

    Frame[3] = (uint8_t)(Arg >> 8); /*!< Construct byte 4 */

    Frame[4] = (uint8_t)(Arg); /*!< Construct byte 5 */

    Frame[5] = (Crc); /*!< Construct CRC: byte 6 */

    for (i = 0; i < 6; i++)
    {
        SD_WriteByte(Frame[i]); /*!< Send the Cmd bytes */
    }
}

/**
  * @brief  Get SD card data response.
  * @param  None
  * @retval The SD status: Read data response xxx0<status>1
  *         - status 010: Data accecpted
  *         - status 101: Data rejected due to a crc error
  *         - status 110: Data rejected due to a Write error.
  *         - status 111: Data rejected due to other error.
  */
uint8_t SD_GetDataResponse(void)
{
    uint32_t i = 0;
    uint8_t response = 0, rvalue = 0;

    while (i <= 64)
    {
        /*!< Read resonse */
        response = SD_ReadByte();
        /*!< Mask unused bits */
        response &= 0x1F;
        switch (response)
        {
        case SD_DATA_OK:
        {
            rvalue = SD_DATA_OK;
            break;
        }
        case SD_DATA_CRC_ERROR:
            return SD_DATA_CRC_ERROR;
        case SD_DATA_WRITE_ERROR:
            return SD_DATA_WRITE_ERROR;
        default:
        {
            rvalue = SD_DATA_OTHER_ERROR;
            break;
        }
        }
        /*!< Exit loop in case of data ok */
        if (rvalue == SD_DATA_OK)
            break;
        /*!< Increment loop counter */
        i++;
    }

    /*!< Wait null data */
    while (SD_ReadByte() == 0);

    /*!< Return response */
    return response;
}

/**
  * @brief  Returns the SD response.
  * @param  None
  * @retval The SD Response:
  *         - SD_RESPONSE_FAILURE: Sequence failed
  *         - SD_RESPONSE_NO_ERROR: Sequence succeed
  */
uint8_t SD_GetResponse(uint8_t Response)
{
    uint32_t Count = 0xFFF;

    /*!< Check if response is got or a timeout is happen */
    while ((SD_ReadByte() != Response) && Count)
    {
        Count--;
    }
    if (Count == 0)
    {
        /*!< After time out */
        return SD_RESPONSE_FAILURE;
    }
    else
    {
        /*!< Right response got */
        return SD_RESPONSE_NO_ERROR;
    }
}

/**
  * @brief  Returns the SD status.
  * @param  None
  * @retval The SD status.
  */
uint16_t SD_GetStatus(void)
{
    uint16_t Status = 0;

    /*!< SD chip select low */
    SD_CS_LOW();

    /*!< Send CMD13 (SD_SEND_STATUS) to get SD status */
    SD_SendCmd(SD_CMD_SEND_STATUS, 0, 0xFF);

    Status = SD_ReadByte();
    Status |= (uint16_t)(SD_ReadByte() << 8);

    /*!< SD chip select high */
    SD_CS_HIGH();

    /*!< Send dummy byte 0xFF */
    SD_WriteByte(SD_DUMMY_BYTE);

    return Status;
}

/**
  * @brief  Put SD in Idle state.
  * @param  None
  * @retval The SD Response:
  *         - SD_RESPONSE_FAILURE: Sequence failed
  *         - SD_RESPONSE_NO_ERROR: Sequence succeed
  */
uint8_t SD_GoIdleState(void)
{
    /*!< SD chip select low */
    SD_CS_LOW();

    /*!< Send CMD0 (SD_CMD_GO_IDLE_STATE) to put SD in SPI mode */
    SD_SendCmd(SD_CMD_GO_IDLE_STATE, 0, 0x95);

    /*!< Wait for In Idle State Response (R1 Format) equal to 0x01 */
    if (SD_GetResponse(SD_IN_IDLE_STATE))
    {
        /*!< No Idle State Response: return response failue */
        return SD_RESPONSE_FAILURE;
    }
    /*----------Activates the card initialization process-----------*/
    do
    {
        /*!< SD chip select high */
        SD_CS_HIGH();

        /*!< Send Dummy byte 0xFF */
        SD_WriteByte(SD_DUMMY_BYTE);

        /*!< SD chip select low */
        SD_CS_LOW();

        /*!< Send CMD1 (Activates the card process) until response equal to 0x0 */
        SD_SendCmd(SD_CMD_SEND_OP_COND, 0, 0xFF);
        /*!< Wait for no error Response (R1 Format) equal to 0x00 */
    }
    while (SD_GetResponse(SD_RESPONSE_NO_ERROR));

    /*!< SD chip select high */
    SD_CS_HIGH();

    /*!< Send dummy byte 0xFF */
    SD_WriteByte(SD_DUMMY_BYTE);

    return SD_RESPONSE_NO_ERROR;
}

/**
  * @brief  Write a byte on the SD.
  * @param  Data: byte to send.
  * @retval None
  */
uint8_t SD_WriteByte(uint8_t Data)
{
    /*!< Wait until the transmit buffer is empty */
    while (SPI_GetFlagStatus(SD_SPI, SPI_FLAG_TXE) == RESET)
    {}

    /*!< Send the byte */
    SPI_SendData(SD_SPI, Data);

    /*!< Wait to receive a byte*/
    while (SPI_GetFlagStatus(SD_SPI, SPI_FLAG_RXNE) == RESET)
    {}

    /*!< Return the byte read from the SPI bus */
    return SPI_ReceiveData(SD_SPI);
}

/**
  * @brief  Read a byte from the SD.
  * @param  None
  * @retval The received byte.
  */
uint8_t SD_ReadByte(void)
{
    uint8_t Data = 0;

    /*!< Wait until the transmit buffer is empty */
    while (SPI_GetFlagStatus(SD_SPI, SPI_FLAG_TXE) == RESET)
    {}
    /*!< Send the byte */
    SPI_SendData(SD_SPI, SD_DUMMY_BYTE);

    /*!< Wait until a data is received */
    while (SPI_GetFlagStatus(SD_SPI, SPI_FLAG_RXNE) == RESET)
    {}
    /*!< Get the received data */
    Data = SPI_ReceiveData(SD_SPI);

    /*!< Return the shifted data */
    return Data;
}

/**
  * @}
  */


/**
  * @}
  */


/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
